[单选题]
A proton strikes an oxygen-18 nucleusjwe791zqpwg :a 1 p+ewcx+6na:)jk jv producing fg9qg pt /kkwn27szy n 9( 3jn:-kgse-qluorine-18 and another particle. What other particle is produced by this ny -jqs- qpng w/9tseknn 73kg2gkz 9:(uclear reaction?
A. a neutron
B. an $\alpha$ particle
C. an $b-$ particle
D. an $b+$ particle
